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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17ac65b70b954c4598c2e6e881af407600335bcd7292487ee36209fb7693cae9' 
  AND token = '4SDPsjedODWTo75kkDUwaIAKeRuRZNiaN4kTJMBtWAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}